20400342431320 has 32 divisors (see below), whose sum is σ = 45901010484000. Its totient is φ = 8160094303488.

The previous prime is 20400342431303. The next prime is 20400342431333. The reversal of 20400342431320 is 2313424300402.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7064956 + ... + 9524404.

It is an arithmetic number, because the mean of its divisors is an integer number (1434406577625).

Almost surely, 2^{20400342431320} is an apocalyptic number.

20400342431320 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20400342431320 is an abundant number, since it is smaller than the sum of its proper divisors (25500668052680).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20400342431320 is a wasteful number, since it uses less digits than its factorization.

20400342431320 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2666827 (or 2666823 counting only the distinct ones).

The product of its (nonzero) digits is 13824, while the sum is 28.

Adding to 20400342431320 its reverse (2313424300402), we get a palindrome (22713766731722).

The spelling of 20400342431320 in words is "twenty trillion, four hundred billion, three hundred forty-two million, four hundred thirty-one thousand, three hundred twenty".